Ubuntu 8.10 install did not recognize the Nokia Multigraph 447X, and now the best resolution possible is 800 X 600. Try this: Edit the xorg.conf file. It can be found in /etc/X11 . This worked for me; however I CANNOT STRESS THIS ENOUGH: BE ABSOLUTELY SURE OF THE VERTICAL REFRESH RATE AND THE HORIZONTAL SYNC RATE OF YOUR MONITOR. IF YOU SET IT TOO HIGH YOU WILL FRY THE MONITOR AND MAYBE EVEN THE VIDEO CARD IN YOUR MACHINE. YOU HAVE BEEN WARNED. This monitor was working on another machine running RedHat Fedora and I took the specs from that - I knew for sure it would work.

The computer is an old Dell 900 mhz Optiplex GX110 500 mb of memory with an added
video card. In the cmos set up be sure the video section is set to Auto and DO NOT enable DAC Snoop.
The video card is: ATI Technologies Inc. 3D Rage IIC 215IIC (Mach64 GT IIC) (Rev 7a)
The processor in the computer is: Pentium III (Coppermine) 930.308 MHz Family(6) Stepping(3)
The Monitor is a Nokia Multigraph 447X
The system is: Ubuntu 8.10 (intrepid)
The Kernel is: 2.6.27-7-generic
GCC Version 4.3.2
I used the graphic install and allowed (against my better judgement) the default partitioning scheme with one big / file.

Here is my xorg.conf file:
The ONLY two lines I added are:

HorizSync	30.0 - 82.0
VertRefresh	50.0 - 110.0

I did not touch the rest of the file.

# xorg.conf (X.Org X Window System server configuration file)
#
# This file was generated by dexconf, the Debian X Configuration tool, using
# values from the debconf database.
#
# Edit this file with caution, and see the xorg.conf manual page.
# (Type "man xorg.conf" at the shell prompt.)
#
# This file is automatically updated on xserver-xorg package upgrades *only*
# if it has not been modified since the last upgrade of the xserver-xorg
# package.
#
# Note that some configuration settings that could be done previously
# in this file, now are automatically configured by the server and settings
# here are ignored.
#
# If you have edited this file but would like it to be automatically updated
# again, run the following command:
#   sudo dpkg-reconfigure -phigh xserver-xorg

Section "Device"
	Identifier	"Configured Video Device"
EndSection

Section "Monitor"
	Identifier	"Configured Monitor"
	HorizSync	30.0 - 82.0
	VertRefresh	50.0 - 110.0
EndSection

Section "Screen"
	Identifier	"Default Screen"
	Monitor		"Configured Monitor"
	Device		"Configured Video Device"
EndSection

This allows 1024x768 with nice color. So far it's working at 75hz refresh rate.